CN101521539B - Wideband digital frequency-selecting wireless repeater system and wideband signal digital frequency-selecting method thereof - Google Patents
Wideband digital frequency-selecting wireless repeater system and wideband signal digital frequency-selecting method thereof Download PDFInfo
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Abstract
The invention provides a wideband digital frequency-selecting wireless repeater system and a wideband signal digital frequency-selecting method thereof. The donor antenna output terminal of the systemis connected with a retransmission antenna input terminal by an donor terminal diplexer, a downlink radio frequency receiver subsystem, a downlink wideband digital intermediate frequency processing s ubsystem, a downlink radio frequency transmitter subsystem, and a mobile terminal diplexer in sequence; a retransmission antenna output terminal is connected with a donor antenna input terminal by a mobile terminal diplexer, an uplink radio frequency receiver subsystem, an uplink wideband digital intermediate frequency processing subsystem, an uplink radio frequency transmitter subsystem, and a donor terminal diplexer in sequence. The invention can be applied to communication systems such as GSM, CDMA, DCS, JDC, TD-SCDMA, WCDMA, CDMA2000, and the like, thereby forming wideband digital frequency-selecting wireless repeater systems with different communication formats and any signal bandwidth.
Description
Technical field
The present invention relates to wireless discharging-directly station, be specifically related to wideband digital frequency-selecting wireless repeater system and wideband signal digital frequency-selecting method thereof.
Background technology
Along with popularizing of mobile communications networks such as GSM, CDMA, TD-SCDMA; The rapid increase of mobile communication subscriber quantity; Telephone traffic among the mobile network is also constantly increasing; Cause communication network to be in the overload operation state, be easy to occur being similar to go offline, cross-talk, speech quality are bad, be difficult to phenomena of the failure such as online.In the face of growing traffic demand, need carry out dilatation to satisfy the requirement of capacity and covering to network.Adopt the dilatation way of cell splitting that its limitation is arranged, constantly approaching along with stop spacing, therefore the interference of network just is difficult in the new base station of increase in the network also in continuous increase after the stop spacing of macrocell base stations acquires a certain degree.The repeater is as network optimization product; Can improve and optimize the network signal covering quality; Solving the indoor degree of depth covering of wireless signal, solving signal covering aspect, the weak district of signal blind zone and signal and all play an important role, at home and abroad all obtaining in the mobile communications network using widely.
Wireless discharging-directly station has very important effect aspect the covering of indoor and outdoor mobile communication signal.At present, in mobile communication engineering, using more is single carrier or broadband artificial antenna direct discharging station.Mainly be to adopt a SAW filter to realize the single carrier arrowband or the frequency-selective filtering of broadband analog signal are handled.Broadband signal refers to the signal of band segment in corresponding full frequency band bandwidth signal of a certain communication system or the full frequency band; Such as China employing 900MHz frequency band GSM communication system; Uplink band is 885～915MHz; The GSM bandwidth signal refers to the signal of any bandwidth in this frequency range, like signals such as 400KHz, 1MHz, 5MHz and 24MHz bandwidth.Broadband signal though bandwidth is very wide, in essence, only is a single-carrier signal that bandwidth is very wide, can adopt the filter processing method of single carrier to realize signal frequency-selecting processing fully.Fig. 1 is single carrier or artificial antenna repeater, broadband principle schematic.Its operation principle is following: retransmitting antenna receives the upward signal of overlay area, the downstream signal that donor antenna receives from the base station passes through low noise amplifier, SAW filter, power amplifier separately; Go out from donor antenna and transmission antennas transmit through duplexer respectively; Thereby realize the processing and amplifying of uplink and downlink signal, improve the wireless coverage effect of mobile communications network.
Mainly there is following problem in the artificial antenna direct discharging station that adopts analogue technique to realize:
(1) need SAW filter to carry out frequency-selective filtering and handle, because SAW filter is an analogue device, the consistency of performance is bad, and debugging difficulty is very big, is unfavorable for production debugging and batch process; (2) in radio repeater system, need a plurality of local oscillation signal reference sources, because the local oscillation signal poor stability that analogue device produces; Frequency of occurrences skew easily; Cause input, the output frequency of system to squint, direct discharging station is easy to occur frequency deviation, causes system normally to use; (3) linear characteristic of analog multiplier is bad, and the phase place after the mixing can change, and differential loss needs amplifier offset, thereby introduces more active noise; (4) the analog filter filtering characteristic is difficult to regulate and is difficult for changing with concrete demands of applications; (5) small product size is bigger, and weight is heavier, is difficult to realize miniaturization, lightness design; (6) the broadband wireless direct discharging station of the analog hardware circuit design of employing function singleness, very flexible, very difficult adaptation is the demand of the wireless communication system of different communication system, multiband nowadays.
Summary of the invention
The objective of the invention is to overcome the shortcoming of existing simulation broad band repeater systems technology; Wideband digital frequency-selecting wireless repeater system and wideband signal digital frequency-selecting method thereof are provided, and scalability of the present invention is good, reduced cost, be convenient to debug and produce and be convenient to realize miniaturization, microminiaturized direct discharging station.
The object of the invention is realized through following technical proposals: wideband digital frequency-selecting wireless repeater system; Comprise up link, down link, repeater power subsystem and monitoring repeater subsystem; Said up link, down link comprise alms giver terminal duplexer, portable terminal duplexer, donor antenna, retransmitting antenna; It is characterized in that; Said down link also comprises downlink radio frequency receiver subsystem, downstream broadband signal digital IF process subsystem, downlink radio frequency transmitter subsystem, and said donor antenna output is connected with the retransmitting antenna input through alms giver terminal duplexer, downlink radio frequency receiver subsystem, downstream broadband signal digital IF process subsystem, downlink radio frequency transmitter subsystem, portable terminal duplexer successively; Said up link also comprises up radio-frequency transmitter subsystem, up broadband signal digital IF process subsystem, up radio frequency sending set subsystem, and said retransmitting antenna output is connected with the donor antenna input through portable terminal duplexer, up radio-frequency transmitter subsystem, up broadband signal digital IF process subsystem, up radio frequency sending set subsystem, alms giver terminal duplexer successively; Said repeater power subsystem and monitoring repeater subsystem are connected with downlink radio frequency receiver subsystem, downstream broadband signal digital IF process subsystem, downlink radio frequency transmitter subsystem, up radio-frequency transmitter subsystem, up broadband signal digital IF process subsystem, up radio frequency sending set subsystem respectively simultaneously.
For realizing the present invention better, said downlink radio frequency receiver subsystem comprises descending low noise amplifier, downlink radio frequency down-conversion subsystem; The output of said descending low noise amplifier is connected with downlink radio frequency down-conversion subsystem input; Said descending low noise amplifier input is connected with the output of alms giver terminal duplexer, and said downlink radio frequency down-conversion subsystem output is connected with the input of downstream broadband signal digital IF process subsystem;
Said downlink radio frequency transmitter subsystem comprises downlink radio frequency up-conversion subsystem, downlink power amplifier; Said downlink radio frequency up-conversion subsystem output is connected with the downlink power amplifier input; The input of said downlink radio frequency up-conversion subsystem is connected with downstream broadband signal digital IF process subsystem output, and the output of said downlink power amplifier is connected with portable terminal duplexer input;
Said up radio-frequency transmitter subsystem comprises up low noise amplifier, up radio frequency down-conversion subsystem; The output of said up low noise amplifier is connected with up radio frequency down-conversion subsystem input; The input of said up low noise amplifier is connected with the output of portable terminal duplexer, and the output of said up radio frequency down-conversion subsystem is connected with the input of up broadband signal digital IF process subsystem;
Said up radio frequency sending set subsystem comprises ascending power amplifier, up RF up-converter subsystem; The output of said up RF up-converter subsystem is connected with the ascending power amplifier input terminal; The input of said up RF up-converter subsystem is connected with the output of up broadband signal digital IF process subsystem, and the output of said ascending power amplifier is connected with the input of alms giver terminal duplexer.
Said downstream broadband signal digital IF process subsystem and up broadband signal digital IF process subsystem comprise A/D converter, broadband signal digital down-conversion subsystem, broadband signal digital up-conversion subsystem, D/A converter respectively, and said A/D converter output is connected with the D/A converter input through broadband signal digital down-conversion subsystem, broadband signal digital up-conversion subsystem successively.
Said broadband signal digital down-conversion subsystem mainly is the wideband digital intermediate-freuqncy signal to be carried out processing such as digital mixing, extraction and digital filtering, moves zero intermediate frequency to intermediate-freuqncy signal, the digital signal of two-forty is extracted be the baseband digital signal of low rate.Broadband signal digital down-conversion subsystem mainly is made up of frequency mixing module, NCO generation module, DDC self-adaptive decision device, multiple variable extraction filter and base band formed filter among the present invention.NCO generation module in the said broadband signal digital down-conversion subsystem is connected with an end of frequency mixing module input, and the other end of frequency mixing module input and the output of A/D modular converter are connected; The output of said frequency mixing module is connected with the input of DDC self-adaptive decision device; The output of said DDC self-adaptive decision device is connected with the input of multiple variable extraction filter; The output of said multiple variable extraction filter is connected with the input of base band formed filter.
Said broadband signal digital up-conversion subsystem mainly be insert in base band data is carried out, processing such as digital filtering and digital mixing; Being modulated to predetermined intermediate frequency to signal, is the digital signal that satisfies intermediate frequency Nyquist sampling thheorem with the digital signal interpolation of low rate.Said broadband signal digital up-conversion subsystem mainly is made up of DUC self-adaptive decision device, the variable interpolation filter group of multiple and I, the multistage modulation module of Q signal.The input of the variable interpolation filter group of multiple in the output of the DUC self-adaptive decision device in the said broadband signal digital up-conversion subsystem and the DUC submodule is connected; I in the output of the variable interpolation filter group of multiple in the said DUC submodule and the DUC submodule, the input of the multistage modulation module of Q signal are connected.
Adopt the wideband signal digital frequency-selecting method of above-mentioned wideband digital frequency-selecting wireless repeater system, comprise the transmission of downstream signal and the transmission of upward signal;
Wherein, the transmission of said downstream signal may further comprise the steps:
(1) donor antenna receives the downstream signal from the base station, through alms giver terminal duplexer, is input to the downlink radio frequency receiver subsystem;
(2) the descending low noise amplifier of downlink radio frequency receiver subsystem carries out processing and amplifying to the downstream signal from alms giver terminal duplexer; And the downlink radio frequency down-conversion subsystem through the downlink radio frequency receiver subsystem; Realization is to the mixing of radiofrequency signal, the down-converted of filtering, and the Low Medium Frequency signal is simulated in output;
(3) analog if signal of downlink radio frequency receiver subsystem output is input to downstream broadband signal digital IF process subsystem; Broadband signal digital IF process subsystem carries out A/D sampling, broadband signal digital down-conversion, broadband signal digital up-conversion and D/A conversion process to analog if signal, the output analog if signal;
(4) analog if signal of downstream broadband signal digital IF process subsystem output; Be input to the downlink radio frequency transmitter subsystem; The downlink radio frequency up-conversion subsystem of downlink radio frequency transmitter subsystem is realized the mixing of analog if signal, the upconversion process of filtering; And the output radiofrequency signal, the radiofrequency signal of downlink radio frequency up-conversion subsystem output obtains further power amplification through downlink power amplifier and handles;
(5) radiofrequency signal of handling through power amplification through portable terminal duplexer and retransmitting antenna, realizes the signal of specific region is covered;
The transmission of said upward signal may further comprise the steps:
(A) retransmitting antenna receives the upward signal of overlay area, through the portable terminal duplexer, is input to up radio-frequency transmitter subsystem;
(B) the up low noise amplifier of up radio-frequency transmitter subsystem carries out processing and amplifying to the upward signal from the portable terminal duplexer; And the up radio frequency down-conversion subsystem through up radio-frequency transmitter subsystem; Realization is to the mixing of radiofrequency signal, the down-converted of filtering, and the Low Medium Frequency signal is simulated in output;
(C) analog if signal of up radio-frequency transmitter subsystem output is input to up broadband signal digital IF process subsystem; Broadband signal digital IF process subsystem carries out A/D sampling, broadband signal digital down-conversion, broadband signal digital up-conversion and D/A conversion process to analog if signal, the output analog if signal;
(D) analog if signal of up broadband signal digital IF process subsystem output; Be input to up radio frequency sending set subsystem; The up RF up-converter subsystem of up radio frequency sending set subsystem is realized the mixing of analog if signal, the upconversion process of filtering; And the output radiofrequency signal, the radiofrequency signal of up RF up-converter subsystem output obtains further power amplification through the ascending power amplifier and handles;
(E) through the radiofrequency signal of ascending power processing and amplifying,, realize that subscriber signal is connected with the base station through alms giver terminal duplexer and donor antenna.
Broadband signal digital down-conversion signal handling process in the said step (3) is following: broadband signal digital down-conversion subsystem receives the digital medium-frequency signal from the output of A/D modular converter; Cos and sin signal that digital medium-frequency signal and NCO generation module produce are input in the frequency mixing module simultaneously, and output is through zero intermediate frequency I, Q signal after the Frequency mixing processing.Zero intermediate frequency I, the Q signal of frequency mixing module output are input in the DDC self-adaptive decision device; DDC self-adaptive decision device is according to the characteristic information of I, Q signal; Like information such as data speed, processing bandwidth, adaptive selection meets data pick-up multiple and the filter coefficient that speed, bandwidth etc. require.Said multiple variable extraction filter receives from the output information of DDC self-adaptive decision device and I, Q signal; And the information that provides according to DDC self-adaptive decision device; Carry out the extraction and the Filtering Processing of data, I, Q signal after output is handled through suitable filtering extraction.I, the Q signal of the output of multiple variable extraction filter select and are with outer inhibition signal usually not meet the requirement of digital frequency-selecting module owing to the band of signal is interior, need be with interior compensation and be with outer inhibition processing the I behind the filtering extraction, Q signal; Therefore, need to adopt the base band formed filter to carry out the moulding Filtering Processing, the base band formed filter is according to the demand of digital frequency-selecting module; In conjunction with digital frequency-selecting module passband fluctuation, the outer requirement that suppresses of band; Design has the digital filter of compensate function in the passband, realizes the compensation deals to signal in the passband, simultaneously; Improve the outer inhibition ability of band, improve the performance of digital frequency-selecting module.Variable multiple decimation filter and base band formed filter can be the filter of FIR, IIR, CIC, HB filter or other form.Said broadband signal digital down-conversion subsystem can utilize programmable logic devices such as CPLD, FPGA, EPLD, DSP to realize, also can use special-purpose asic chip to realize.
Broadband signal digital up-conversion signal handling process in the said step (3) is following: mixing, extraction and filtered baseband I, Q data through broadband signal digital down-conversion subsystem are input in the DUC self-adaptive decision device in the broadband signal digital up-conversion subsystem and go.DUC self-adaptive decision device is according to characteristic informations such as the data rate of baseband I, Q data, bandwidth; And combine requirements such as data rate that the digital intermediate frequency system requires to export, bandwidth; Adaptive selection meets the interpolation of data multiple that speed, bandwidth etc. require; And according to slotting the processing or multistage interior slotting processing in the definite selection of the multiple one-level, and, reasonably select the coefficient of interpolation filter etc. according to slotting treatment requirement in each level.The variable interpolation filter group of received of said multiple is from the output information of DUC self-adaptive decision device and I, Q signal; And the information that provides according to DUC self-adaptive decision device; Carry out the interior of data and insert and Filtering Processing, I, Q signal after output is handled through suitable interpolation filtering.The variable interpolation filter group of this multiple can be made up of the one-level interpolation filter, also can be made up of multistage interpolation filter group, generally speaking, only needs to use 1～2 grade of interpolation filter to get final product.I, Q signal after the interior slotting and Filtering Processing of the variable interpolation filter group of process multiple are input in I, the multistage modulation module of Q signal and go, through the multistage mixing and the modulation treatment of I, the multistage modulation module of Q signal, and digital intermediate frequency I, the Q signal of output high speed.I, the multistage modulation module of Q signal generally are made up of 1～2 grade of mixed modulated module, if in the follow-up DAC submodule, have the one-level mixed modulated and handle, and then I, the multistage modulation module of Q signal can omit the processing of one-level mixed modulated.Filter in the variable interpolation filter group of said multiple can be the filter of FIR, IIR, CIC, HB filter or other form.Said broadband signal digital up-conversion subsystem can utilize programmable logic devices such as CPLD, FPGA, EPLD, DSP to realize, also can use special-purpose asic chip to realize.
The broadband signal digital down-converted is identical with broadband signal digital upconversion process mode with the middle broadband signal digital down-converted of broadband signal digital upconversion process mode and step (3) in the above-mentioned steps (C).
The present invention compared with prior art has following advantage and beneficial effect:
(1) based on software radio thought; Adopt digital if technology realize to broadband signal extraction, interiorly insert, mixing and Filtering Processing; Abandoned the processing method of utilizing SAW filtering in the simulation direct discharging station; Reduce the use of analogue device, improved the consistency of systematic function, be convenient to system debug and production.
(2) adopt the method for digital filtering, it is very little that the passband fluctuation of filter can be done, and is with very high that outer inhibition can do, and improved the performance of signal filtering; The phase place of digital filter has good linear characteristic, has avoided the influence of the phase nonlinear of SAW to systematic function.
(3) can keep arbitrarily to change the bandwidth of signal as requested under the constant situation of hardware platform; Simultaneously, only need the software in the modification system, just can accomplish the compatible digital frequency-selecting wireless repeater system of the different bandwidth of standard arbitrarily fully, system has good applicability and extensibility.
(4) be easy to realize the miniaturization and the microminiaturization of wideband digital frequency-selecting wireless repeater system.
(5) the present invention can be applicable in the communication system systems such as GSM, CDMA, DCS, JDC, TD-SCDMA, WCDMA, CDMA2000, forms the wideband digital frequency-selecting wireless repeater system of different communication standard.
Description of drawings
Fig. 1 is single carrier or artificial antenna repeater, broadband principle schematic;
Fig. 2 is the theory diagram of wideband digital frequency-selecting wireless repeater system of the present invention;
Fig. 3 is downstream broadband signal digital IF process subsystem of the present invention or up broadband signal digital IF process subsystem structure block diagram;
Fig. 4 is a broadband signal digital down-conversion subsystem sketch map of the present invention;
Fig. 5 is a broadband signal digital up-conversion subsystem sketch map of the present invention.
Embodiment
Below in conjunction with embodiment and accompanying drawing the present invention is described in further detail, but execution mode of the present invention is not limited thereto.
Embodiment
As shown in Figure 2; Wideband digital frequency-selecting wireless repeater system comprises up link, down link, repeater power subsystem and monitoring repeater subsystem; Said up link, down link comprise alms giver terminal duplexer, portable terminal duplexer, donor antenna, retransmitting antenna; Said down link also comprises downlink radio frequency receiver subsystem, downstream broadband signal digital IF process subsystem, downlink radio frequency transmitter subsystem, and said donor antenna output is connected with the retransmitting antenna input through duplexer, downlink radio frequency receiver subsystem, downstream broadband signal digital IF process subsystem, downlink radio frequency transmitter subsystem, alms giver terminal duplexer, portable terminal duplexer successively; Said up link also comprises up radio-frequency transmitter subsystem, up broadband signal digital IF process subsystem, up radio frequency sending set subsystem, and said retransmitting antenna output is connected with the donor antenna input through portable terminal duplexer, up radio-frequency transmitter subsystem, up broadband signal digital IF process subsystem, up radio frequency sending set subsystem, alms giver terminal duplexer successively; Said repeater power subsystem and monitoring repeater subsystem are connected with downlink radio frequency receiver subsystem, downstream broadband signal digital IF process subsystem, downlink radio frequency transmitter subsystem, up radio-frequency transmitter subsystem, up broadband signal digital IF process subsystem, up radio frequency sending set subsystem respectively simultaneously.
Said downlink radio frequency receiver subsystem comprises descending low noise amplifier, downlink radio frequency down-conversion subsystem; The output of said descending low noise amplifier is connected with downlink radio frequency down-conversion subsystem input; Said descending low noise amplifier input is connected with the output of alms giver terminal duplexer, and said downlink radio frequency down-conversion subsystem output is connected with the input of downstream broadband signal digital IF process subsystem;
Said downlink radio frequency transmitter subsystem comprises downlink radio frequency up-conversion subsystem, downlink power amplifier; Said downlink radio frequency up-conversion subsystem output is connected with the downlink power amplifier input; The input of said downlink radio frequency up-conversion subsystem is connected with downstream broadband signal digital IF process subsystem output, and the output of said downlink power amplifier is connected with portable terminal duplexer input;
Said up radio-frequency transmitter subsystem comprises up low noise amplifier, up radio frequency down-conversion subsystem; The output of said up low noise amplifier is connected with up radio frequency down-conversion subsystem input; The input of said up low noise amplifier is connected with the output of portable terminal duplexer, and the output of said up radio frequency down-conversion subsystem is connected with the input of up broadband signal digital IF process subsystem;
Said up radio frequency sending set subsystem comprises ascending power amplifier, up RF up-converter subsystem; The output of said up RF up-converter subsystem is connected with the ascending power amplifier input terminal; The input of said up RF up-converter subsystem is connected with the output of up broadband signal digital IF process subsystem, and the output of said ascending power amplifier is connected with the input of alms giver terminal duplexer.
Said repeater power subsystem is that downlink radio frequency receiver subsystem, downstream broadband signal digital IF process subsystem, downlink radio frequency transmitter subsystem, up radio-frequency transmitter subsystem, up broadband signal digital IF process subsystem, up radio frequency sending set subsystem provide power supply.
Said monitoring repeater subsystem is monitored and is controlled downlink radio frequency receiver subsystem, downstream broadband signal digital IF process subsystem, downlink radio frequency transmitter subsystem, up radio-frequency transmitter subsystem, up broadband signal digital IF process subsystem, up radio frequency sending set subsystem, and carries out alarming processing etc. to unusual subsystem occurring.Aspect circuit design, the monitoring repeater subsystem can provide the monitoring and the alarm of following device parameter: power supply power-fail alarm, power failure alarm, the indication of up power output, up gain are alarmed, upward line output standing-wave ratio alarm, the alarm of up phase locked source losing lock, down output power indication, descending gain alarm, descending overpower are alarmed, descending excess temperature is alarmed, line output standing-wave ratio alarm and the alarm of descending phase locked source losing lock etc. down.Monitor And Control Subsystem can also be accomplished the controlled function to the following parameter of system: upward line output automatic electric-level control, line output automatic electric-level control down, carrier switch function, carrier frequency point are provided with functions such as function, carrier gains distribution.
As shown in Figure 3; Downstream broadband signal digital IF process subsystem or up broadband signal digital IF process subsystem comprise A/D converter, broadband signal digital down-conversion subsystem, broadband signal digital up-conversion subsystem, D/A converter, and said A/D converter output is connected with the D/A converter input through broadband signal digital down-conversion subsystem, broadband signal digital up-conversion subsystem successively.
Said broadband signal digital down-conversion subsystem mainly is the wideband digital intermediate-freuqncy signal to be carried out processing such as digital mixing, extraction and digital filtering, moves zero intermediate frequency to intermediate-freuqncy signal, the digital signal of two-forty is extracted be the baseband digital signal of low rate.The functional structure chart of broadband signal digital down-conversion subsystem is as shown in Figure 4 among the present invention.Broadband signal digital down-conversion subsystem mainly is made up of frequency mixing module, NCO generation module, DDC self-adaptive decision device, multiple variable extraction filter and base band formed filter.NCO generation module in the said DDC submodule is connected with an end of frequency mixing module input, and the other end of frequency mixing module input and the output of A/D modular converter are connected; The output of said frequency mixing module is connected with the input of DDC self-adaptive decision device; The output of said DDC self-adaptive decision device is connected with the input of multiple variable extraction filter; The output of said multiple variable extraction filter is connected with the input of base band formed filter.
Broadband signal digital down-conversion subsystem signals handling process is following: broadband signal digital down-conversion subsystem receives the digital medium-frequency signal from the output of A/D modular converter; Cos and sin signal that digital medium-frequency signal and NCO generation module produce are input in the frequency mixing module simultaneously, and output is through zero intermediate frequency I, Q signal after the Frequency mixing processing.Zero intermediate frequency I, the Q signal of frequency mixing module output are input in the DDC self-adaptive decision device; DDC self-adaptive decision device is according to the characteristic information of I, Q signal; Like information such as data speed, processing bandwidth, adaptive selection meets data pick-up multiple and the filter coefficient that speed, bandwidth etc. require.Said multiple variable extraction filter receives from the output information of DDC self-adaptive decision device and I, Q signal; And the information that provides according to DDC self-adaptive decision device; Carry out the extraction and the Filtering Processing of data, I, Q signal after output is handled through suitable filtering extraction.I, the Q signal of the output of multiple variable extraction filter select and are with outer inhibition signal usually not meet the requirement of digital frequency-selecting module owing to the band of signal is interior, need be with interior compensation and be with outer inhibition processing the I behind the filtering extraction, Q signal; Therefore; Need to adopt the base band formed filter to carry out the moulding Filtering Processing, the base band formed filter adopts certain strategy according to the demand of digital frequency-selecting module; Realization is to the compensation deals of signal in the passband; Simultaneously, improve the outer inhibition ability of band, improve the performance of digital frequency-selecting module.Variable multiple decimation filter and base band formed filter can be the filter of FIR, IIR, CIC, HB filter or other form.Said broadband signal digital down-conversion subsystem can utilize programmable logic devices such as CPLD, FPGA, EPLD, DSP to realize, also can use special-purpose asic chip to realize.
Said broadband signal digital up-conversion subsystem mainly be insert in the base band data to the broadband carries out, processing such as digital filtering and digital mixing; Being modulated to predetermined intermediate frequency to signal, is the digital signal that satisfies intermediate frequency Nyquist sampling thheorem with the digital signal interpolation of low rate.The functional structure chart of broadband signal digital up-conversion subsystem is as shown in Figure 5 among the present invention.Said broadband signal digital up-conversion subsystem mainly is made up of DUC self-adaptive decision device, the variable interpolation filter group of multiple and I, the multistage modulation module of Q signal.The input of the variable interpolation filter group of multiple in the output of the DUC self-adaptive decision device in the said DUC submodule and the DUC submodule is connected; I in the output of the variable interpolation filter group of multiple in the said DUC submodule and the DUC submodule, the input of the multistage modulation module of Q signal are connected.
Broadband signal digital up-conversion signal handling process is following: through the mixing of broadband signal digital down-conversion subsystem, extraction and filtered baseband I, Q data, be input in the DUC self-adaptive decision device in the broadband signal digital up-conversion subsystem and go.DUC self-adaptive decision device is according to characteristic informations such as the data rate of baseband I, Q data, bandwidth; And combine requirements such as data rate that the digital intermediate frequency system requires to export, bandwidth; Adaptive selection meets the interpolation of data multiple that speed, bandwidth etc. require; And according to slotting the processing or multistage interior slotting processing in the definite selection of the multiple one-level, and, reasonably select the coefficient of interpolation filter etc. according to slotting treatment requirement in each level.The variable interpolation filter group of received of said multiple is from the output information of DUC self-adaptive decision device and I, Q signal; And the information that provides according to DUC self-adaptive decision device; Carry out the interior of data and insert and Filtering Processing, I, Q signal after output is handled through suitable interpolation filtering.The variable interpolation filter group of this multiple can be made up of the one-level interpolation filter, also can be made up of multistage interpolation filter group, generally speaking, only needs to use 1～2 grade of interpolation filter to get final product.I, Q signal after the interior slotting and Filtering Processing of the variable interpolation filter group of process multiple are input in I, the multistage modulation module of Q signal and go, through the multistage mixing and the modulation treatment of I, the multistage modulation module of Q signal, and digital intermediate frequency I, the Q signal of output high speed.I, the multistage modulation module of Q signal generally are made up of 1～2 grade of mixed modulated module, if in the follow-up DAC submodule, have the one-level mixed modulated and handle, and then I, the multistage modulation module of Q signal can omit the processing of one-level mixed modulated.Filter in the variable interpolation filter group of said multiple can be the filter of FIR, IIR, CIC, HB filter or other form.Said broadband signal digital up-conversion subsystem can utilize programmable logic devices such as CPLD, FPGA, EPLD, DSP to realize, also can use special-purpose asic chip to realize.
In conjunction with Fig. 2, Fig. 3, Fig. 4 and Fig. 5,, comprise the transmission of downstream signal and the transmission of upward signal based on the wideband signal digital frequency-selecting method of wideband digital frequency-selecting wireless repeater system;
The transmission of said downstream signal may further comprise the steps:
(1) donor antenna receives the downstream signal from the base station, through alms giver terminal duplexer, is input to the downlink radio frequency receiver subsystem;
(2) the descending low noise amplifier of downlink radio frequency receiver subsystem carries out processing and amplifying to the downstream signal from alms giver terminal duplexer; And the downlink radio frequency down-conversion subsystem through the downlink radio frequency receiver subsystem; Realization is to the mixing of radiofrequency signal, the down-converted of filtering, and the Low Medium Frequency signal is simulated in output; IF-FRE is generally about 50MHz～300MHz;
(3) analog if signal of downlink radio frequency receiver subsystem output is input to downstream broadband signal digital IF process subsystem; Downstream broadband signal digital IF process subsystem carries out A/D sampling, broadband signal digital down-conversion, broadband signal digital up-conversion and D/A conversion process to analog if signal, the output analog if signal;
(4) analog if signal of downstream broadband signal digital IF process subsystem output; Be input to the downlink radio frequency transmitter subsystem; The downlink radio frequency up-conversion subsystem of downlink radio frequency transmitter subsystem is realized the mixing of analog if signal, the upconversion process of filtering; And the output radiofrequency signal, the radiofrequency signal of downlink radio frequency up-conversion subsystem output obtains further power amplification through downlink power amplifier and handles;
(5) radiofrequency signal of handling through power amplification through portable terminal duplexer and retransmitting antenna, realizes the signal of specific region is covered.
The transmission of said upward signal may further comprise the steps:
(A) retransmitting antenna receives the upward signal of overlay area, through the portable terminal duplexer, is input to up radio-frequency transmitter subsystem;
(B) the up low noise amplifier of up radio-frequency transmitter subsystem carries out processing and amplifying to the upward signal from the portable terminal duplexer; And the up radio frequency down-conversion subsystem through up radio-frequency transmitter subsystem; Realization is to the mixing of radiofrequency signal, the down-converted of filtering, and the Low Medium Frequency signal is simulated in output;
(C) analog if signal of up radio-frequency transmitter subsystem output is input to up broadband signal digital IF process subsystem; Broadband signal digital IF process subsystem carries out A/D sampling, broadband signal digital down-conversion, broadband signal digital up-conversion and D/A conversion process to analog if signal, the output analog if signal;
(D) analog if signal of up broadband signal digital IF process subsystem output; Be input to up radio frequency sending set subsystem; The up RF up-converter subsystem of up radio frequency sending set subsystem is realized the mixing of analog if signal, the upconversion process of filtering; And the output radiofrequency signal, the radiofrequency signal of up RF up-converter subsystem output obtains further power amplification through the ascending power amplifier and handles;
(E) through the radiofrequency signal of ascending power processing and amplifying,, realize that subscriber signal is connected with the base station through alms giver terminal duplexer and donor antenna.
Broadband signal digital down-conversion signal handling process in the said step (3) is following: broadband signal digital down-conversion subsystem receives the digital medium-frequency signal from the output of A/D modular converter; Cos and sin signal that digital medium-frequency signal and NCO generation module produce are input in the frequency mixing module simultaneously, and output is through zero intermediate frequency I, Q signal after the Frequency mixing processing.Zero intermediate frequency I, the Q signal of frequency mixing module output are input in the DDC self-adaptive decision device; DDC self-adaptive decision device is according to the characteristic information of I, Q signal; Like information such as data speed, processing bandwidth, adaptive selection meets data pick-up multiple and the filter coefficient that speed, bandwidth etc. require.Said multiple variable extraction filter receives from the output information of DDC self-adaptive decision device and I, Q signal; And the information that provides according to DDC self-adaptive decision device; Carry out the extraction and the Filtering Processing of data, I, Q signal after output is handled through suitable filtering extraction.I, the Q signal of the output of multiple variable extraction filter select and are with outer inhibition signal usually not meet the requirement of digital frequency-selecting module owing to the band of signal is interior, need be with interior compensation and be with outer inhibition processing the I behind the filtering extraction, Q signal; Therefore; Need to adopt the base band formed filter to carry out the moulding Filtering Processing, the base band formed filter adopts certain strategy according to the demand of digital frequency-selecting module; Realization is to the compensation deals of signal in the passband; Simultaneously, improve the outer inhibition ability of band, improve the performance of digital frequency-selecting module.Variable multiple decimation filter and base band formed filter can be the filter of FIR, IIR, CIC, HB filter or other form.Said broadband signal digital down-conversion subsystem can utilize programmable logic devices such as CPLD, FPGA, EPLD, DSP to realize, also can use special-purpose asic chip to realize.
Broadband signal digital up-conversion signal handling process in the said step (3) is following: mixing, extraction and filtered baseband I, Q data through broadband signal digital down-conversion subsystem are input in the DUC self-adaptive decision device in the broadband signal digital up-conversion subsystem and go.DUC self-adaptive decision device is according to characteristic informations such as the data rate of baseband I, Q data, bandwidth; And combine requirements such as data rate that the digital intermediate frequency system requires to export, bandwidth; Adaptive selection meets the interpolation of data multiple that speed, bandwidth etc. require; And according to slotting the processing or multistage interior slotting processing in the definite selection of the multiple one-level, and, reasonably select the coefficient of interpolation filter etc. according to slotting treatment requirement in each level.The variable interpolation filter group of received of said multiple is from the output information of DUC self-adaptive decision device and I, Q signal; And the information that provides according to DUC self-adaptive decision device; Carry out the interior of data and insert and Filtering Processing, I, Q signal after output is handled through suitable interpolation filtering.The variable interpolation filter group of this multiple can be made up of the one-level interpolation filter, also can be made up of multistage interpolation filter group, generally speaking, only needs to use 1～2 grade of interpolation filter to get final product.I, Q signal after the interior slotting and Filtering Processing of the variable interpolation filter group of process multiple are input in I, the multistage modulation module of Q signal and go, through the multistage mixing and the modulation treatment of I, the multistage modulation module of Q signal, and digital intermediate frequency I, the Q signal of output high speed.I, the multistage modulation module of Q signal generally are made up of 1～2 grade of mixed modulated module, if in the follow-up DAC submodule, have the one-level mixed modulated and handle, and then I, the multistage modulation module of Q signal can omit the processing of one-level mixed modulated.Filter in the variable interpolation filter group of said multiple can be the filter of FIR, IIR, CIC, HB filter or other form.Said broadband signal digital up-conversion subsystem can utilize programmable logic devices such as CPLD, FPGA, EPLD, DSP to realize, also can use special-purpose asic chip to realize.
The broadband signal digital down-converted is identical with broadband signal digital upconversion process mode with the middle broadband signal digital down-converted of broadband signal digital upconversion process mode and step (3) in the above-mentioned steps (C).
Said embodiment is a preferred implementation of the present invention; But execution mode of the present invention is not limited by the examples; Other any do not deviate from change, the modification done under spirit of the present invention and the principle, substitutes, combination, simplify; All should be the substitute mode of equivalence, be included within protection scope of the present invention.
Claims (7)
1. wideband digital frequency-selecting wireless repeater system; Comprise up link, down link, repeater power subsystem and monitoring repeater subsystem; Said up link, down link comprise alms giver terminal duplexer, portable terminal duplexer, donor antenna, retransmitting antenna; It is characterized in that: said down link also comprises downlink radio frequency receiver subsystem, downstream broadband signal digital IF process subsystem, downlink radio frequency transmitter subsystem, and said donor antenna output is connected with the retransmitting antenna input through alms giver terminal duplexer, downlink radio frequency receiver subsystem, downstream broadband signal digital IF process subsystem, downlink radio frequency transmitter subsystem, portable terminal duplexer successively; Said up link also comprises up radio-frequency transmitter subsystem, up broadband signal digital IF process subsystem, up radio frequency sending set subsystem, and said retransmitting antenna output is connected with the donor antenna input through portable terminal duplexer, up radio-frequency transmitter subsystem, up broadband signal digital IF process subsystem, up radio frequency sending set subsystem, alms giver terminal duplexer successively; Said repeater power subsystem and monitoring repeater subsystem are connected with downlink radio frequency receiver subsystem, downstream broadband signal digital IF process subsystem, downlink radio frequency transmitter subsystem, up radio-frequency transmitter subsystem, up broadband signal digital IF process subsystem, up radio frequency sending set subsystem respectively simultaneously;
Said downstream broadband signal digital IF process subsystem and up broadband signal digital IF process subsystem comprise A/D converter, broadband signal digital down-conversion subsystem, broadband signal digital up-conversion subsystem, D/A converter respectively, and said A/D converter output is connected with the D/A converter input through broadband signal digital down-conversion subsystem, broadband signal digital up-conversion subsystem successively;
Said broadband signal digital down-conversion subsystem comprises frequency mixing module, NCO generation module, DDC self-adaptive decision device, multiple variable extraction filter and base band formed filter; Said NCO generation module is connected with an end of frequency mixing module input, and the other end of frequency mixing module input and the output of A/D modular converter are connected; The output of said frequency mixing module is connected with the input of DDC self-adaptive decision device; The output of said DDC self-adaptive decision device is connected with the input of multiple variable extraction filter; The output of said multiple variable extraction filter is connected with the input of base band formed filter;
Said broadband signal digital up-conversion subsystem comprises DUC self-adaptive decision device, the variable interpolation filter group of multiple and I, the multistage modulation module of Q signal; The input of the variable interpolation filter group of multiple in the output of the DUC self-adaptive decision device in the said broadband signal digital up-conversion subsystem and the DUC submodule is connected; I in the output of the variable interpolation filter group of multiple in the said DUC submodule and the DUC submodule, the input of the multistage modulation module of Q signal are connected.
2. wideband digital frequency-selecting wireless repeater system according to claim 1 is characterized in that: said downlink radio frequency receiver subsystem comprises descending low noise amplifier, downlink radio frequency down-conversion subsystem; The output of said descending low noise amplifier is connected with downlink radio frequency down-conversion subsystem input; Said descending low noise amplifier input is connected with the output of alms giver terminal duplexer, and said downlink radio frequency down-conversion subsystem output is connected with the input of downstream broadband signal digital IF process subsystem;
Said downlink radio frequency transmitter subsystem comprises downlink radio frequency up-conversion subsystem, downlink power amplifier; Said downlink radio frequency up-conversion subsystem output is connected with the downlink power amplifier input; The input of said downlink radio frequency up-conversion subsystem is connected with downstream broadband signal digital IF process subsystem output, and the output of said downlink power amplifier is connected with portable terminal duplexer input;
Said up radio-frequency transmitter subsystem comprises up low noise amplifier, up radio frequency down-conversion subsystem; The output of said up low noise amplifier is connected with up radio frequency down-conversion subsystem input; The input of said up low noise amplifier is connected with the output of portable terminal duplexer, and the output of said up radio frequency down-conversion subsystem is connected with the input of up broadband signal digital IF process subsystem;
Said up radio frequency sending set subsystem comprises ascending power amplifier, up RF up-converter subsystem; The output of said up RF up-converter subsystem is connected with the ascending power amplifier input terminal; The input of said up RF up-converter subsystem is connected with the output of up broadband signal digital IF process subsystem, and the output of said ascending power amplifier is connected with the input of alms giver terminal duplexer.
3. based on the wideband signal digital frequency-selecting method of claim 1 or 2 said wideband digital frequency-selecting wireless repeater systems, it is characterized in that: comprise the transmission of downstream signal and the transmission of upward signal; Wherein, the transmission of said downstream signal may further comprise the steps:
(1) donor antenna receives the downstream signal from the base station, through alms giver terminal duplexer, is input to the downlink radio frequency receiver subsystem;
(2) the descending low noise amplifier of downlink radio frequency receiver subsystem carries out processing and amplifying to the downstream signal from alms giver terminal duplexer; And the downlink radio frequency down-conversion subsystem through the downlink radio frequency receiver subsystem; Realization is to the mixing of radiofrequency signal, the down-converted of filtering, and the Low Medium Frequency signal is simulated in output;
(3) analog if signal of downlink radio frequency receiver subsystem output is input to downstream broadband signal digital IF process subsystem; Broadband signal digital IF process subsystem carries out A/D sampling, broadband signal digital down-conversion, broadband signal digital up-conversion and D/A conversion process to analog if signal, the output analog if signal;
(4) analog if signal of downstream broadband signal digital IF process subsystem output; Be input to the downlink radio frequency transmitter subsystem; The downlink radio frequency up-conversion subsystem of downlink radio frequency transmitter subsystem is realized the mixing of analog if signal, the upconversion process of filtering; And the output radiofrequency signal, the radiofrequency signal of downlink radio frequency up-conversion subsystem output obtains further power amplification through downlink power amplifier and handles;
(5) radiofrequency signal of handling through power amplification through portable terminal duplexer and retransmitting antenna, realizes the signal of specific region is covered;
The transmission of said upward signal may further comprise the steps:
(A) retransmitting antenna receives the upward signal of overlay area, through the portable terminal duplexer, is input to up radio-frequency transmitter subsystem;
(B) the up low noise amplifier of up radio-frequency transmitter subsystem carries out processing and amplifying to the upward signal from the portable terminal duplexer; And the up radio frequency down-conversion subsystem through up radio-frequency transmitter subsystem; Realization is to the mixing of radiofrequency signal, the down-converted of filtering, and the Low Medium Frequency signal is simulated in output;
(C) analog if signal of up radio-frequency transmitter subsystem output is input to up broadband signal digital IF process subsystem; Broadband signal digital IF process subsystem carries out A/D sampling, broadband signal digital down-conversion, broadband signal digital up-conversion and D/A conversion process to analog if signal, the output analog if signal;
(D) analog if signal of up broadband signal digital IF process subsystem output; Be input to up radio frequency sending set subsystem; The up RF up-converter subsystem of up radio frequency sending set subsystem is realized the mixing of analog if signal, the upconversion process of filtering; And the output radiofrequency signal, the radiofrequency signal of up RF up-converter subsystem output obtains further power amplification through the ascending power amplifier and handles;
(E) through the radiofrequency signal of ascending power processing and amplifying, through alms giver terminal duplexer and donor antenna, the realization subscriber signal is connected with the base station;
Said step (3) or (C) in broadband signal digital down-conversion signal handling process following: broadband signal digital down-conversion subsystem receives the digital medium-frequency signal from the output of A/D modular converter; Cos and sin signal that digital medium-frequency signal and NCO generation module produce are input in the frequency mixing module simultaneously, and output is through zero intermediate frequency I, Q signal after the Frequency mixing processing; Zero intermediate frequency I, the Q signal of frequency mixing module output are input in the DDC self-adaptive decision device; DDC self-adaptive decision device is according to the characteristic information of I, Q signal; Said characteristic information comprises data rate, processing bandwidth, selects to meet the data pick-up multiple and the filter coefficient of data rate, processing bandwidth requirement adaptively; Said multiple variable extraction filter receives from the output information of DDC self-adaptive decision device and I, Q signal, and according to the information that DDC self-adaptive decision device provides, carries out the extraction and the Filtering Processing of data, I, Q signal after output is handled through filtering extraction; The outer inhibition of compensation and band handled output baseband I, Q signal in I, the Q signal of base band formed filter after to filtering extraction was with.
4. wideband signal digital frequency-selecting method according to claim 3; It is characterized in that: said step (3) or (C) in broadband signal digital up-conversion signal handling process following: mixing, extraction and filtered baseband I, Q signal through broadband signal digital down-conversion subsystem are input in the DUC self-adaptive decision device in the broadband signal digital up-conversion subsystem and go; DUC self-adaptive decision device is according to the characteristic information of baseband I, Q data; Said characteristic information comprises data rate, processing bandwidth; Select to meet the interpolation of data multiple of data rate, processing bandwidth requirement adaptively; And according to slotting the processing or multistage interior slotting processing in the definite selection of the multiple one-level, and, reasonably select the coefficient of interpolation filter according to slotting treatment requirement in each level; The variable interpolation filter group of received of said multiple is from the output information of DUC self-adaptive decision device and I, Q signal; And the information that provides according to DUC self-adaptive decision device; Carry out the interior of data and insert and Filtering Processing, I, Q signal after output is handled through suitable interpolation filtering; I, Q signal through after the interior slotting and Filtering Processing of the variable interpolation filter group of multiple are input in I, the multistage modulation module of Q signal, through the multistage mixing and the modulation treatment of I, the multistage modulation module of Q signal, and output digital intermediate frequency I, Q signal at a high speed.
5. wideband signal digital frequency-selecting method according to claim 3 is characterized in that: the filter that said multiple variable extraction filter and base band formed filter adopt comprises FIR, IIR, CIC, HB filter; Said broadband signal digital down-conversion subsystem adopts programmable logic device to comprise that CPLD, FPGA, EPLD, DSP realize, perhaps adopt special-purpose asic chip to realize.
6. wideband signal digital frequency-selecting method according to claim 4 is characterized in that: the variable interpolation filter group of said multiple is made up of the one-level interpolation filter, perhaps is made up of multistage interpolation filter group; I, the multistage modulation module of Q signal are made up of 1～2 grade of mixed modulated module.
7. wideband signal digital frequency-selecting method according to claim 4 is characterized in that: the filter that the filter in the variable interpolation filter group of said multiple adopts comprises FIR, IIR, CIC, HB filter; Said broadband signal digital up-conversion subsystem adopts programmable logic device to comprise that CPLD, FPGA, EPLD, DSP realize, perhaps adopt special-purpose asic chip to realize.
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| CN101854744A (en) * | 2009-03-31 | 2010-10-06 | 奥维通信股份有限公司 | GSM (Global System for Mobile Communication) digital multichannel frequency-selecting repeater and multichannel digital frequency-selecting digital signal processing method adopted thereby |
| CN102291157B (en) * | 2011-05-13 | 2014-01-01 | 京信通信系统（中国）有限公司 | Multi-system channel multiplex circuit |
| CN103685099B (en) * | 2012-09-25 | 2017-05-24 | 京信通信系统（中国）有限公司 | A method and an apparatus for performing frequency conversion adjustment on a signal |
| CN103929388B (en) * | 2014-04-23 | 2017-10-03 | 大唐移动通信设备有限公司 | A kind of data handling system and processing method |
| CN106411386B (en) * | 2016-10-20 | 2023-04-14 | 泉州市凯润通信科技有限公司 | Full-band repeater |
| CN107104682A (en) * | 2017-05-04 | 2017-08-29 | 中国电子科技集团公司第三十八研究所 | A kind of ETC roadside unit receive-transmit systems of multi-channel digital integration |
| CN109391274B (en) * | 2018-09-25 | 2020-06-30 | 中国联合网络通信集团有限公司 | Data processing method and processing device, wireless relay equipment and medium |
| CN111082828B (en) * | 2019-12-18 | 2021-12-10 | 华普特科技（深圳）股份有限公司 | Self-adaptive frequency conversion and frequency shift method and system |
| CN114024557B (en) * | 2021-11-24 | 2023-06-06 | 京信网络系统股份有限公司 | Signal transmission method, signal access and coverage unit |
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| CN1467940A (en) * | 2002-07-12 | 2004-01-14 | 京信通信系统（广州）有限公司 | Wireless frequency selecting repeater |
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